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The role of Annexin 1 in [Ca2+]cyt dynamics

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If you have a question about this talk, please contact Suzy Stoodley .

Plants translate stress stimuli as well as metabolic changes through specific changes (“signatures”) in cytosolic free Ca2+ ([Ca2+]cyt). The channels involved remain poorly characterized. Annexins (Ca2+-dependent membrane-binding proteins) have recently been shown to act as Ca2+-permeable channels in plants. Annexin 1 (ATANN1) of the model plant Arabidopsis thaliana was also implicated in mediating stress signalling in roots and could be acting as a channeI. It is expressed in root epidermal cells and these are accessible to [Ca2+]cyt measurements. Its presence in leaves and its role in drought stress has also been previously shown. We have used yellow cameleon 3.6 (YC3.6) to monitor in vivo differences in [Ca2+]cyt dynamics between wild type and the atann1 knock-out mutant on guard cells and will show preliminary root imaging work.

This talk is part of the Plant Sciences Research Seminars series.

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